Boiler.



No.. 740,304. A PATENTED SEPT. 29, 1903.-

J. MGWILLIA-MS.

BOILER.

APPLIUATION FILED APB. 27. 1903. n E0 MODEL. y v 2 SHEETS-SHEET 1.

2 jrg. j. 751

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J. MGWILLIAMSL,

B-Ol-ILBR., Pm-wurm man mmm. 1903.

2 SHEETS-SHEET Z.

K0 MODEL.

A Trams/5 ys.

WITNESSES.'

ite. 'video-.

UNITED STATES:-

atented September 2,9, IQO.

PATENT OFFICE.

BOlLEFi.-

SPECIFICATION forming part of Lettersratent ne. 740,304, dated'september 29, 190e.

' Application filed April 27, 1903. Serial No. 154,469. (No model.)

T0 all whom t may concern:

. Be it known that I, JAMES MCWILLIAMS, a citizen o' the United States,and a resident of Jersey. City, in the county of Hudson and State of NewJersey, have invented4 a new and Improved`Boiler,`of which the followingis a full, clear, and exact description. v

The object of the invention is to provide a new and improved boilerwhich is simple and durable in construction, comparatively cheap tomanufacture, and arranged to insure quick circulation of the water. andto produce a large heatingsurface in a comparatively small space.Y

The invention consists of novel features and parts and combinations ofthe same, as will be more fully described hereinafter and -thenpointed-out in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference4 indicate corresponding parts in bothviews.

Figure lis a cross-section of the improvement on the line l l of Fig. 2arranged as a double furnace-boiler, and Fig. 2 is a'longitudinalsectional elevation of the same on the line 2 2 of Fig. 1`.

The shell A of the boiler consists, essentially, of front and rear headsA and A2, an

approxim'ately semicircular top AS, and a seg-V mental bottom Al,havinga radius considerably longer than that of the top A3 to form astrong brace for the top, as will be readily understood by reference toFig. 1.

The bottom A4 of 'the shell A for a double furnace-boiler is connectedby water-tubes B B with side mud-drums C C and by watertubes B2 B3 witha small mud-drum C2, and the said mud-drums C, C', and C2 rest onsupports D, D', and D2, of which the supports D D2 sustain a grate E,and the supports D2 D carry a grate E'.

For a single furnace boiler the middle drum C2 and the sets ot'water-tubes B2 B3 are omitted and the single grate extends from thesupport D to the support D.

The water-tubes B B' are inclined upwardly and inwardly, while thewater-tubes B? B3 are inclined upwardly and outwardly, as plainly shownin Fig. 1, and the said water-tubes form, with the mud-drums and thegrates E E', the fire-box of the boiler.

The sides of the shell A are connected at the junction of the top A3 andbottom A4 by casing side plates F F with the side muddrums C C', and theforward and rearward ends of the side plates vF E" connect with a fronthead F2 and a rear head F3, ot which the latter is provided on theinside with a 'bridge-wall G, having an opening Gr directly under thebottom A4 of the shell toconnect with a connecting or combustion chamberH, establishing connection between the rear end of the lire-box and therear end of a smokereturn ilue I, held in the heads A' and A2 andextending lengthwise through 'the shell A. The forward end of thesmoke-return ue I is projected a distance beyond the front head A tosupport a smoke-.stack J, opening at its lower end into the front end ofthe smokereturn iiue I. The latter is provided at its front end with asuitable door l' for cleaning the smoke-return liue l Whenever it isdeemed necessary. p

In order to strongly sustain the smoke-return llue l within the shell A,a plurality of braces K is employed, preferably in theshape of-flatplates set transversely and connected with angle-ironsK and K2, of whichthe angleirons K are secured to the under side of the top A3, while theangle-irons K2 are secured exteriorly to the top of the smoke-returnliue I, as plainly indicated in the drawings. Staybolts K3 connect thebottom of the returndue l with the bottom A4 of the shell.

The combustion-chamber H is preferably formed of an inner casing H',covered on the outside by asbestos H2, held in place by a covering-plateH3, as plainlyindicated in Fig. 2, and the rear or outer wall of thecasing H is preferably perforated, so as to prevent the plate frombuckling when subjected to the high heat passing from the lire-boxthrough the combustion-chamber to the return-Hue I. The frontcasing-head F2 is provided with suitable doors for giving access to thelireboxes and also with doors leading tothe ashpits formed below thegrates EE' in the usual manner.

vNew by reference to Fig. l it will be seen that the water-tubes B, B',andA B2 are ar- ICO ranged in transverse sets of six or more tubes indepth for each set, and the sets extend throughout the length of thelmud-drums, so that the heat generated in the fire-boxes comes in.contact with the said tubes B, B', B2, and B3 to highly heat the watertherein and to insure a quick circulation of the Water. It isunderstoodthat the innermost tubes of each set are heated to a higher degree thanthose farther out, and consequently the water will rise in the innermost'tubes from the mud-drums C, C', and C2 into the shell Aand flowbackagain through the outermost tubes from the shell back into the muddrumswithout the use of large return-pipes.

By making the -bottom A4 comparatively flat it is evident that the upperends of the tubes B, B', B2, and B3 can be readily connected with thebottom A4 and securely expanded and beaded in place. It will further beseen that by the arrangement described a very large heating-surface isprovided in a comparatively small space, and hence the boiler is veryserviceable for use as a marine boiler.

Having 4thus described my invention, I claim as new andv desire tosecure by Letters Patent-, v

l. A boiler, comprising a shell, a returnflue suspended within the shelland having its forward end projecting beyond the front head of the shelland provided with a door therein, three spaced mud-drums extendinglongitudinally below the shell, grates between the drums, sets ofwater-tubes inclined upwardly and inwardly and connecting the sidemuddrums with the shell, two sets of water-tubes inclined upwardlyandoutwardly and connecting the center mud-drum with the shell, a chamberconnecting the rear end of the lire-box with the rear end of thereturn-flue, and a smoke-flue supported upon and opening into theforward end of the return-lille, as set forth.

l2. A boiler comprising a shell, a returnflue suspended within theshell, spaced muddrums extending longitudinally below the said shell, agrate between the mud-drums, sets of water-tubes connecting themud-drums throughout their length with the bottom of the said shell, thesaid tubes forming with the grate a fire-box, and a connecting-chamberconnecting the rear end of the'iire-box with the rear end of thereturn-flue, the said connecting-chamber having a perforated inner wall,a sheet-iron cover and an asbestos filling between the wall and cover,as set forth.

3. Aboilercomprisingashellhaving heads, a top section and a bottomsection, a returnliue extending through the shell and held in the saidheads, stay-bolts connecting the bot- 'tom section of the shell` withthe bottom of y the said return-liuc, and braces connecting the upperportion of the top section of the shell with the top of the saidreturn-flue, as set forth.

4. Aboiler,comprisingashellhavingheads, a top and a bottom section, areturn-flue suspended in the shell and having its forward end projectingbeyond the front head of the shell and provided with a door, abridge-wall having anopening directly below the bottom section of theshell, mud-drums extending longitudinally below the shell, a gratebetween the drums, water-tubes connecting the mud-drums with the shell,a combustionchamber extending from the upper end of vthe bridge-wall tothe rear head of. the shell and connecting the {ire-box with thereturn'- ue, and a smoke-line supported upon and opening into theprojecting end of the return-line, as set forth.

In testimony whereof I have signed my name to this specification in thepresence 'of two subscribing witnesses.

JAMES MCWILLIAMS.

Witnesses:

EDWARD K. MEsroK, GUsrAv SoHoNHER'r.

